Update README.md

README.md

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 # Summary
 
-This is a random sample (shuffle with seed 27) of MRQA dataset, with 30k train, 6k validation, and 3k test examples. The dataset fields have been converted to SQuAD format.
+This is a random sample (shuffle with seed 27) of MRQA dataset, with 15k train, 1k validation, and 500 test examples. The dataset fields have been converted to SQuAD format.